Magnetic force on a moving charge and on a wire

Answer Key - Grade 11 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   A 2 μC charged bead moves at 400 m/s at right angles to a 0.6 T field. What force acts on it, to 0.01 mN, Ari?

   0.48 mN
2. 2.

   A 5 μC charged bead moves at 300 m/s at right angles to a 0.3 T field. What force acts on it, to 0.01 mN, Bo?

   0.45 mN
3. 3.

   A 1.5 μC charged bead moves at 800 m/s at right angles to a 0.5 T field. What force acts on it, to 0.01 mN, Kira?

   0.6 mN
4. 4.

   In the diagram, which way is the force on the positive charge, Jun?

   • To the right, along its motion
   • Up the page
   • Down the page
5. 5.

   In the diagram, which way is the force on the positive charge, Luz?

   • Up the page
   • Down the page
   • Out of the page, along the field
6. 6.

   A charged bead moves straight along the field lines. What magnetic force acts on it, Noah?

   • Zero, since its motion is along the field
   • The full qvB, along the field lines
   • Half of qvB, pushing it forward
7. 7.

   At what angle between the motion and the field is the magnetic force greatest, Pia?

   • 0°
   • 90°
   • 45°
8. 8.

   A charged bead sits at rest in a magnetic field. What magnetic force acts on it, Ren?

   • qB, pointing along the field
   • A force that starts it moving along the field
   • Zero, since it is not moving
9. 9.

   In the diagram, which way is the force on the wire, Tala?

   • Up the page
   • Down the page
   • To the right, along the current
10. 10.

    In the diagram, which way is the force on the wire, Zee?

    • Out of the page, along the field
    • To the right
    • To the left